Discharge valve



Dec. 13, 1927.

'- R. L. CAWOOD DISCHARGE VALVE I Filed Dec. 23. 1926 2 Sheets-Sheet l RICHARD L.. CAWOOD A TTORNEYS Dec. 13, 1927.

. 1,652,929 R. L. CAWOOD DISCHARGE VALVE Filed Dec. 23. 1926 2 Sheets-Sheet 2 52' Z? 4 TTOR/VEKS Patented Dec. 13, 1927.

V t rnr reins.

RICHARD L. GAWOOD, OF EAST LIVERPOOL, OHIO, ASSIGNOR TO THE PATTERSON FOUNDRY & MACHINE COIVIFANY, OF EAST LIVERPOOL, OHIO, A CORPORATION OF OHIO.

DISCHARGE VALVE.

Application filed December 23, 1926. Serial No. 156,596.

My invention relates to discharge valves and particularly to a valve adapted to control the discharge port of apebble mill or the like,-in which the function of the mill is effected by means of free bodies such as pebbles, balls, shot and the like, contained within the mill and acting upon the charge incident to the rotation of the mill.

In mills oi this character, the charge is commonly either initially fluid in character, or is-rendered so by the mill operation, so that it may be drained off by gravity or by pressure.

One object of my invention is to provide a discharge valve, the plug of which has a face solid flush with the inner surface of the mill wall when the valve is closed durin the when the valve is opened for discharge, permits the charge to drain out therethrough, while'restraining the pebbles, balls or the like from escape.

Another object of my-invention is to provide a valve plug adapted for detachable connection with a discharge fitting of appropriate character, through which the chargemay be directed to a conveniently located receptacle. 7

Another object of my invention is to provide an improved detachable mounting for the valve in the mill wall, so that it may be readily removed from outside of mill for cleaning or repair.

Other objects of my invention reside in the provision oi parts of simple construction and assembly, rugged in service, and various details of advantage hereinafter more particularly described or shown in the accompanying drawings, in which.

Fig. 1 is a vertical section through a valve, shown in closed position, in which my invention is embodied in preferred form, and showing a discharge fitting in position to be attached-to the valve plug;

Fig. 2 is a broken end elevation of the valve and valve mounting plate, detached from the mill wall;

Fig. 3 is a view similar to Fig. 1, but showing the valve open and'the discharge fitting attached; and

Fig. 4 is a section on the line 44,.Fig. 3.

The cylindrical shell ota mill of this character is commonly providediwith a retractor-y lining 16. At an appropriate point in the mill wall is located. a fill. aperture not shown) and, generally opposite thereto, the discharge aperture 17.

In accordance with my invention I pr0- vide at the discharge aperture a valve-carrying plate 18' riveted or bolted at 19 to the mill shell and having a cylindrical flange 20 which bushes the aperture 17 and sup ports the mill lining 16, with the inner face of which the edge of the flange is flush. By .making this plate independent of the valve casing 21, the latter and its associated parts may be made standard and uniform, while the shape of the plate 18 and the depth of the flange 20 may be varied to meet the requirements of mills of different diameters, and linings of different thicknesses. This feature of advantage is not essential to the valve construction, and it for any reason desired, the valve casing 21 and carrying plate 18 may be integral.

The valve casing 21 as shown, has a mounting flange 22 secured to the plate 18 by machine screws 23 (Fig. 2). Snugly fitting (or integral with) the bushing flange 20 is the cylindrical inner wall 2 1 of the valve casing. Projecting outwardly, and of less diameter, is the neck 25 of the casing.

At the inner end of the neck 25 is formed the bevelled seat 26 for valve 27, both of which may be ground.

. The valve 27 has integral therewith at its inner end aplug head 28, which is solid and at its outer end a tubular stem 29. The plug head comprises a disc spaced from the valve web 27 to aflord, with the casing wall 24:, a receiving chamber 30. Extending into this chamber from the periphery of the disc is a flange 31 provided with openings 32 of such restricted size that while the fluid charge may pass freely therethrough, when the valve is open (Fig. 3) the pebbles, balls, etc. within the mill are restrained against escape. The face of the disc is preferably 'concaved to the contour of the cylinder linescape by the set screws 39, the heads of which engage the annular channel 10 formed inthe inner face of the nut flange ll. The inward travel of the valve to open position is limited, as well as its rectilinear movement determined, by the screw pin 42 which passes through the casing wall 25 and enters the channel d3 formed in the outer face of the valve stem.

The operation of the valve is readily understood. During rotation of the mill the valve occupies the position indicated in Fig. 1, in which the plug disc 28 lies flush with the inner surface of the mill lining, and affords a support for the pebbles, balls or the like, as the valve passes beneath them. lVhile the fit of the disc 28 within the inner wall 24 of the casing is snug, it is not intended that this fit shall be liquid tight. The joint between the valve web 27 and valve seat 26 is depended upon to insure the seal. The function of the plug disc 28 is primarily (1) that of a filler or wall section constituting a smooth continuation of the inner wall surface of the mill, and that of a support for the flange which bars the entry of the pebbles into chamber 30 when the valve is opened.

After the milling operation is complete, the mill is halted with the discharge opening down. Before the valve is opened, the distributing attachment 36 is connected to the tubular valve stem. Thereupon, the nut 38 is rotated in a direction to cause the inward movement of the valve. As soon as the ports 82 of screw flange 31 are exposed beyond the inner face of the mill lining, the fluid charge flows therethrough into chamber 30, through ports 33 in the hollow valve stem to the interior of the latter, and thus to the discharge fitting 86.

Various modifications will occur to those skilled in the art which depart from the details of my construction, while still embodying the thoughts which underlie what I claim as my invention.

I claim 1. A valve fitting comprising a casing having a seat and wall extending inwardly therefrom,in combination with a valve co operating with said seat to form a seal, and a head rigid with said valve and fitting within said casing wall beyond the valve, said valve and head being spaced apart to form a receiving chamber, together with a perforated flange extending from the peripheral area of the head toward the valve toform a screen.

2. A valve fitting comprising a casing having a seat and a wall extending inwardly therefrom, in combination with a valve cooperating with said seat to form a seal, and a head rigid with said valve and fitting within said casing wall beyond the valve,

said valve and head being spaced apart to form a receiving chamber, together with a perforated flange extending from the pe ripheral area of the head toward the valve to form a screen, and means limiting the opening travel of the *alvc to maintain the screen in operative position when the valve is open. a

3. A valve fitting comprising a casing shaped to afford a valve seat, a tubular extension on opposite sides thereof, in co'mb1 nation with avalve fitted to said seat and forming a seal therewith, a head rigid with said valve and sliding in the tubular extension of the casing to one side of said seat, and a hollow stern rigid with the valve and sliding in the tubular extension of the casing to the opposite side of said seat, said hollow stem being laterally ported for the purpose specified.

4. A valve fitting comprising a valve casing having a seat, the crosssectional area of the casing to one side of said seatexceeding that of the casing to the opposite side of said seat, in combination with a valve cooperating with said seat, a plug extension of said valve closing, in closed valve posi-- tion, the portion of the valve casing of greater cross-sectional area, but moving from obstructing position when the valve is shifted to open position, together with a tubular stem for said valve diaphragm, said stem sliding in the portion of the casing of less cross-sectional area and having ports which in open-valve position are exposed to the casing area of greater cross-section.

5. The combination with the construction specified in claim 4, of a screen associated with the valve head and serving, in open valve position, to prevent the entry of foreign substances to the valve casing.

6. A valve fitting for the outlet port of a refractory lined pebble mill or the like, said fitting comprising a plate rigidly secured to the mill shell and having an integral collar to bush the outlet port of the mill casing and its refractory lining, in combination with a valve casing having a flange overlying the said plate and detachably secured thereto to permit ready removal of the valve casing forcleaning and repair, together with a valve mounted in said casing and comprising a valve headsubstantially flush with the inner face of the mill lining and affording a continuoussupport for the grindingelement of the mill in closed valve position, said valve being inwardly displaceable to. open the discharge port.

7. A valve fitting for the outlet port of a refractory lined pebble mill or the like, said fitting comprising a valve casing having a seat, and a wall extending inwardly therefrom to a point substantially co-incident with the inner face of the lining, in combination with a valve cooperating with saidseat, and a head rigid with said valve, and affording, in closed valve position, an imperdiameter to afford an outlet for discharge forate surface in substantial continuation of of fluid from the mill when the valve and 10 the mill lining and substantially closing the its associated head are inwardly displaced outlet port defined by said inwardly extendto open the discharge port.

5 ing Wall. In testimony whereof I have signed my 8. A valve fitting of the construction speciname to-this specification.

fled in claim 7 in which the valve head is connected to the valve by a neck of reduced RICHARD L. CAl/VOOD. 

